#home_container {
    width: 820px;
    height: 1000px;
    background-color: white;
    border: 1px solid #CCC;
}
.holder {
    width: 70px;
    height: 70px;
    border: 1px solid #CCC;
    border-radius: 24px;
    float: left;
}
.row {
    clear: both;
}
.grey {
    background-color: gray;
}
.yellow {
    background-color: yellow;
}
.red {
    background-color: red;
}
.blue {
    background-color: blue;
}
.ball {
    position: absolute;
    width: 70px;
    height: 70px;
    border-radius: 50%;
}
.potencijalno {
    opacity: 0.3;
}